Practical Measurement of the Diameter and Specification of the Particles with Micro-size level using the Appropriate Phenomena of Micro-Step Flow.

为环境工程中颗粒场流动换热的控制，研究了微通道后向台阶流动中不同粒径颗粒混合流动换热的影响。在微尺度区域，通过装置和外力控制局部增减传热是不容易的，但可以利用流动中多尺度荧光粒子混合的非直接现象来实现。由于速度分布的原因，不同粒径颗粒的轨迹线可能因不同粒径颗粒的阻力影响而不同。然后，大颗粒和中型颗粒的通过将更加强调速度分布的变化。至少需要三种粒径才能执行和检测这种现象。通过对连续图像和不成熟图像的分析，得出了一些定性的有趣效果，待建立和确定新的图像处理方法后，得到定量的结果并报告。混合粒子与微步流的影响数据库可以通过粒子跟踪线显示粒子的直径和规格，这对于环境工程系统中特殊粒子的检测具有实际的应用价值。

In micro-channel flow with backward facing step, the effects of the flow and heat transfer with the mixture of multi-size particles are investigated experimentally for the control of the flow and heat transfer with particles field for the environmental engineering. In the area of micro-size, it is not easy to control the heat transfer with increasing and decreasing locally by devices and external forces but it is possible to perform using non-direct phenomena with the mixture of multi-size fluorescent particles in the flow. Because of the velocity distribution, the tracking line of multi-size particles may be different from the drag effects of the each body size. Then, the velocity distribution would be changed more emphasized by big-sized particles and passing by mid-sized particles. It would be needed three kind of particle size at least to perform and detect the phenomena.From the results, several qualitative interesting effects were given with the continuous pictures and immature image analysis, and the quantitative results would be got and reported after the building and confirming the newer image processing methods. The data-base of the effects with the mixture particles and micro-step flow would indicate the diameter and specifications of the particle with tracking line of particles, which will be very useful for the applications of the detection of the special particles in the environmental engineering systems with the practical situations.